Get time in seconds or usec. Used as a wrapper around
gettimeofday. Values used by uucico to
do time charging for items transmitted.

gnu/libexec/uucp/libunix/time.c

Get time in seconds. Used as a wrapper around
gettimeofday. Values used by uucico to
do time charging for items transmitted.

gnu/usr.bin/tar/getdate.y

Obtain current timezone. This file does contain code which
converts a date into seconds since the epoch. This code
completely rejected dates specified with --newer flag beyond
2000 in versions prior to 12th Jan, 1999, 11:00 PST.